Abstract
‘Second-order’ models for meiotic analysis have been developed for tetraploid and pentaploid hybrids to address a number of situations intermediate between the established ‘first-order’ models. They all incorporate a third parameter of relative affinity, z, intermediate between x and y, the relative affinities of the most and least closely related genomes respectively. Four such models are described: a 2:(1:1) and a (2:1):1 for tetraploid hybrids; and a 2:(1:1):1 and a (2:1):1:1 for pentaploid hybrids. Examples of their application are given. Where z≈x, or z≈y, then interpretation through the simpler first-order models is appropriate. In other cases application of second-order models can reveal more subtle relationships among the genomes in a hybrid.
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Chapman, C., Kimber, G. Developments in the meiotic analysis of hybrids. V. Second-order models for tetraploids and pentaploids. Heredity 68, 205–210 (1992). https://doi.org/10.1038/hdy.1992.33
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DOI: https://doi.org/10.1038/hdy.1992.33
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